fc8dc48020
git-subtree-dir: third_party/abseil_cpp git-subtree-mainline:ffb2ae54begit-subtree-split:768eb2ca28
66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
// Copyright 2017 The Abseil Authors.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// https://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
//
|
|
// This file includes routines to find out characteristics
|
|
// of the machine a program is running on. It is undoubtedly
|
|
// system-dependent.
|
|
|
|
// Functions listed here that accept a pid_t as an argument act on the
|
|
// current process if the pid_t argument is 0
|
|
// All functions here are thread-hostile due to file caching unless
|
|
// commented otherwise.
|
|
|
|
#ifndef ABSL_BASE_INTERNAL_SYSINFO_H_
|
|
#define ABSL_BASE_INTERNAL_SYSINFO_H_
|
|
|
|
#ifndef _WIN32
|
|
#include <sys/types.h>
|
|
#endif
|
|
|
|
#include <cstdint>
|
|
|
|
#include "absl/base/port.h"
|
|
|
|
namespace absl {
|
|
ABSL_NAMESPACE_BEGIN
|
|
namespace base_internal {
|
|
|
|
// Nominal core processor cycles per second of each processor. This is _not_
|
|
// necessarily the frequency of the CycleClock counter (see cycleclock.h)
|
|
// Thread-safe.
|
|
double NominalCPUFrequency();
|
|
|
|
// Number of logical processors (hyperthreads) in system. Thread-safe.
|
|
int NumCPUs();
|
|
|
|
// Return the thread id of the current thread, as told by the system.
|
|
// No two currently-live threads implemented by the OS shall have the same ID.
|
|
// Thread ids of exited threads may be reused. Multiple user-level threads
|
|
// may have the same thread ID if multiplexed on the same OS thread.
|
|
//
|
|
// On Linux, you may send a signal to the resulting ID with kill(). However,
|
|
// it is recommended for portability that you use pthread_kill() instead.
|
|
#ifdef _WIN32
|
|
// On Windows, process id and thread id are of the same type according to the
|
|
// return types of GetProcessId() and GetThreadId() are both DWORD, an unsigned
|
|
// 32-bit type.
|
|
using pid_t = uint32_t;
|
|
#endif
|
|
pid_t GetTID();
|
|
|
|
} // namespace base_internal
|
|
ABSL_NAMESPACE_END
|
|
} // namespace absl
|
|
|
|
#endif // ABSL_BASE_INTERNAL_SYSINFO_H_
|